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International Automotive Technicians Network
Re: I Appears That I Need To Be Educated
Posted to Technical Discussion Forum on 1/3/2011

This is a note that came from TSB 04-17-04, it is the best answer I can give with documention.

FUEL TRIMS AT IDLE ARE PARTICULARLY SENSITIVE TO VACUUM LEAKS SINCE THE UN-METERED AIR "LEAKAGE FLOW" IS A HIGHER PERCENTAGE OF TOTAL AIRFLOW AT IDLE THAN AT PART ... Login to read more.